title: Waveguide-enhanced 2D-IR spectroscopy in the gas phase.
abstract: A method for obtaining high-quality 2D-IR spectra of gas-phase samples is presented. Time-resolved IR absorption spectroscopy techniques, such as 2D-IR spectroscopy, often require that beams are focused into the sample. This limits the exploitable overlapped path length through samples to a few millimeters. To circumvent this limitation, 2D-IR experiments have been performed within a hollow waveguide. This has enabled acquisition of 2D-IR spectra of low-concentration gas-phase samples, with more than an order of magnitude signal enhancement compared with the equivalent experiment in free space. The technique is demonstrated by application to the 2D-IR spectroscopy of iron pentacarbonyl.
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Greetham
authors.forename: Ian P
authors.initials: IP
authors.lastname: Clark
authors.forename: Damien
authors.initials: D
authors.lastname: Weidmann
authors.forename: Michael N R
authors.initials: MN
authors.lastname: Ashfold
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Orr-Ewing
authors.forename: Michael
authors.initials: M
authors.lastname: Towrie